The H3 runs hot (up to 80°C+ without cooling). Some cheap enclosures lack heatsinks. Linux firmware may have thermal throttling disabled by default. Add a heatsink (14x14x10mm) and a small fan for 24/7 operation.
On some H3 boards, if there’s a valid bootloader in NAND, it will ignore an SD card. You must either hold the boot button (FEL) or erase the NAND first. PhoenixCard with "Product" mode solves this.
Create a PhoenixCard with "Recovery" or "Clear NAND" option. Some firmware images include a bootable rescue system that bypasses internal storage.
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